Wlan1 error while getting interface flags no such device

Usually Networks crafters are front of this kind of errors; there are two reasons behind this error.

1-        Operating system can't recognize the plugged device due to miss of driver (I will not discuss this problem here…)

2-       Network card is correctly recognized but can't get IP address.

first thing to do in order to solve this problem is to make sure that the network card correctly  plugged and recognized on the system using  lspci or lsub command depending of the type of NC (Network Card), in my case I'm using an usb Wi-Fi adapter.

 So the network card is known for the system, else it's a type 1 problem …

Secondly we have to find which alias is used to identify the adapter, the simple way is to iterate possible combination (if you have a simpler manner to find the match alias please share it with us)

Wlan1 is my Wifi usb adapter alias ... we have then to edit /etc/network/interfaces as bellow

Restart network service and it's resolved!

NB: In your case Wlan1 may be eth0, eth1 ..etc.

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